caa a22 4500 397570929 CHVBK 20180308164841.0 cr unu---uuuuu 161202e19960401xx s 000 0 eng 10.1093/ee/25.2.227 doi (NATIONALLICENCE)oxford-10.1093/ee/25.2.227 Moyal Pascal ORSTOM, B.p. 1434, Bouake, Côte d'Ivoire Statistical Model of Crop Losses Caused by Maize Stem Borers (Lepidoptera: Noctuidae, Pyralidae) in Côte d'Ivoire [Elektronische Daten] [Pascal Moyal] Six experiments were conducted in the savanna and forest areas of Côte d'Ivoire to study the influence of stem borers on maize crop yield components and production. Statistical models showed the effect of the oldest preimaginal instars of 2 stem borers, Eldana saccharina Walker (Pyralidae) and Busseola fusca (Fuller) (Noctuidae). Plant destruction was mainly caused by early attack of B. fusca. Attack by both borers on or about the 60th d after emergence induced plant sterility. Stem borers had no direct effect on number of grains per cob-carrying plant: the level of this yield component was set according to the level of the previously determined components through a compensation phenomenon. The last yield component, average weight of grain, decreased with attack by E. saccharina occurring on or about the 80th d after emergence. Effects of borer aggregation, maize variety, and maize streak virus incidence were studied. The statistical model of crop loss, which explains 81.7% of the variation in yield, was validated from the results of 3 trials that were not included in the regression analysis. It enables one to estimate accurately crop losses in most of Côte d'Ivoire with only 2 samplings during the growing season, on the 40th and 80th d after emergence. © 1996 Entomological Society of America Pest Management and Sampling nationallicence maize borers nationallicence crop loss nationallicence statistical model nationallicence West Africa nationallicence Environmental Entomology Oxford University Press 25/2(1996-04-01), 227-236 0046-225X 25:2<227 1996 25 ee https://doi.org/10.1093/ee/25.2.227 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1093/ee/25.2.227 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Moyal Pascal ORSTOM, B.p. 1434, Bouake, Côte d'Ivoire NATIONALLICENCE 773 0- Environmental Entomology Oxford University Press 25/2(1996-04-01), 227-236 0046-225X 25:2<227 1996 25 ee Metadata rights reserved CC BY-NC-4.0 http://creativecommons.org/licenses/by-nc/4.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-oxford